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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6686d110f4db4e18b1d0ae62e9452f1d146cc4037d0995dfdedab792fef7415' 
  AND token = '/gKFw/uvLuM0Dk0QkuX6c70mwGgzott+ONbTdJRpE0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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