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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ff7225e1806ac796a6343d6a48eba263e3036fca529e4765594fb5b2101c5f' 
  AND token = 'YgGFWv0EJqVpULXXuuHVVl6s3Uoyd57u5zkuHG6fcPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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