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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c11522f441e0cea4728a2cf4b1d7797f9c69df869f119cd69bf8e5637ca873' 
  AND token = 'HiqV6l4uXCJ9bWVrsI/D4tJKahkTIWU5A4upNMpIs+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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