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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9adbd453ea3d258398fa5200232e2c23a078f748591e7c0898a29540d3c2446' 
  AND token = 'gK5W+8OJnxPBQ05/1HuToK8mwoz1PnWAoLJy5T7mGHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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