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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a47367dd2674631f24c3a25251f3c88f21abbb3a95c68ff16f283d9b6d1f6fd' 
  AND token = '1BxHIFr9gy87T8FXU/RDJrmBBek1QQSqKtJYTFIWWfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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