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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4299dda434e682cb8551b9cc64003d6599aedd51f364345d873b5ecfe8f0f16e' 
  AND token = 'no10IHogr0vkptkBq7qqw54NDZSwn3cy62InyoLX074=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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