SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c927c5879e0545c53d29a4d1d36f8c61d1a3fc99be43c83652142c1a838b777e' 
  AND token = 'srnH3C9anzelyjKhsNw2iXJNPDbx0Iv5+mSHJgvpKwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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