SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80974980654dfa3ed1becfa698adec01da455692fc7f09df38e4534203765ee3' 
  AND token = 'TwZK2oTKECeJtCiCTOwgh6Kzs5FfD6zJpqY/hyDcPI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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