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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db674691f7befbb526535356b231ab3f57e49c2d77e8148e5b2db9466dc00210' 
  AND token = 'nyKqKRTnQN32vGsSoosWDBmO5dIUd4Hz0UD88nremWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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