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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cba684de76a042cff67fb06fd7bd7c0936c3d100cfbf2791d8436fec8860bec' 
  AND token = '+id4iXn6tJ9m4VyaDvUtHvDal9kPWtF/oMn+nQJSRwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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