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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90927729ef8a07cdb9442e47c9d821330c80a87897fa51a5851473b14b49e6a' 
  AND token = 'D1HSMr0F/u7QcYDYVbRvLbXd/WfzVV0KCYqCzURUhxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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