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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c44d034fd4032db3d865e3b8daf0e5ac58de09ca22b7bcb213bb1e4be0c9b1' 
  AND token = 'eIJqKHjE4CgQYqu8R3U+nrfHqSXQOmWaBeIkK01cxrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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