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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fe9b83eff57ec426e85effc4cf5d518f58f1e00ecbb24bbb583968963dabd5' 
  AND token = 'TYC5680wT8J/wxtVXBvK/OYkye98NAeSwvpP1t2QjH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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