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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03a9c1c96baf06596a40989a84fdbfe51344f173cc5705fbc4dd5f137338312' 
  AND token = '35nyfji7PQLpZ2ffa/3bYtmRx/crz/64UML+ALTnop0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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