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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca603ffaa792aa4a73e9cc97b2314beeed79cc2633ba42e329747a8a6d98f25' 
  AND token = '75kFDvtPsDxn35UWB7QiHyVlFc6gxsCmNl3i67NUuRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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