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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3c6e33862fd0a038878d74080490673b393589da63b9584ed7be67928502de' 
  AND token = 'GOL3p9R9ie/PE+F1MKA7MINnmjBDbwnatWWMM6xWQUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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