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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e147767cae1c1f4a3b61906e346ba969348c05571cdf86e6f3a7a91b21dcd36' 
  AND token = '2J2jUN/abI1BLMymf7trwMGaFM41O/4N1R/ni4EMm38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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