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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf88b26d47894635c9df771d0b2557c572214f786404f248d0437d3968249382' 
  AND token = 'ZeiHy8YvgfTPZxw5QQfQCC7PEkMNHeceFmr+Lwc77eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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