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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a038a10c2560421ddae771c7eeb98e9f1f371c1e4feba3c36d3b2ed559a9c8' 
  AND token = '/dcsKFdnkmCOJJ9hMj6jw9g9EEf5yCf79rS859Zux/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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