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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a359f3b5b6891d76d8e058476eb27330e4cdc9311812e4758572c54e43222cf3' 
  AND token = 'laM3Pm3N0LRnNe7KL88OIqRTPOO7XcjmuBdSKe8p9+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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