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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50ad3a18b207b97ae5729e781294a89927b71b636d4afc254f922846c25efab' 
  AND token = 'ZkexMtF7ZFBkUPpPbkIhuyrGzh5VyR8il6v70FMzKFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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