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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea83944e5bd5a3c678f23b68360b5ea823beddfa0ad3d2807a56e0bd6771c8ac' 
  AND token = 'VAZFQQx2TUTOUm2KnKaldd4YMv1H9SYkCE0WyB/qy/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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