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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ceb983b18c1d4f1bbc3b83171958028a0e9ca870b5fd36d062329016eb3207' 
  AND token = 'cuTW2oajF/b8xP7dkXdg4WTuZWvre9brPrVjFAdnbU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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