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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f792af53f86cbf8bcb9fbf5cd842c7ef0ba88a29c3e200f34086b5ab27bcc95d' 
  AND token = 'xGfDbg1XWg7PqHDi4FM5o9QD7/E1GqoIStVw2S6ZGss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}