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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5b207e7e777f80b9338118b805df1d49db135c005c92739ddecbf694b37053' 
  AND token = 'ehnTIEL0tZdruKaYApg25E3ZKJKrVh8cV0BZJ+hjxmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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