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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9e869653c54c39e93c738a941c73f9380cf4c5f72f9bbe9dd7925f1c4d3646' 
  AND token = '+hxN+7B8ht4GUlMQaWrA1w03DxXF5ofR2GYkKmPCkRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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