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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568b3a970e0835b460092254377ea428cd3b3b780b04876f6beec8bf3b7749a0' 
  AND token = '5SXnJDKUEs8epeu0nCq5kgZlcsymYb4n5nL9d9txA7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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