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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd651ce6bb7d6628ca81ccfdaf7a4a1c807a872d9d8f5028c475cb23b9d368bd4' 
  AND token = '+gvHY5N2eYmBKo26g+T+A5ncnQ7y4CExHZc8haaIdog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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