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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c144f96a4d654038f847c750e4768c4c6498488bb894176a99ab78fec682bacc' 
  AND token = 'qd7ZYThz8sJmRQ+FyYbpGjxD6W+1OakIG9Pjz6B9D9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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