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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbc720841f38f2cc9266d12d7bfb6d84ffcf13b45e346834ad30b1113564ab8' 
  AND token = 'LRWt2ZpRk/d2ztIOENPorwoO2hb3t2b6EHeWpujdqKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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