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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4597471fba7ee2871c3bc1f25b71c99551678c313c2a96938d27fd314266228' 
  AND token = 'bb+xTx4cozHimZdnn7pO0r/h1K4VINghJRxCS1/OFFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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