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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1624769757cdf27b75c1b223f51097e61df285379d4de5137a839179d96e843b' 
  AND token = 'UTxX6WBpQgzTiJd9r6tanK50DQEzRpucGraTQ0yoxIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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