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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53484cdaa13d36944633ddf4a1c515aca93e4210f61f3711646188c53aa7195a' 
  AND token = 'ae24oZ9G93AXPFqRlaLJEP4dKqKSypA0AwY0/ZV9WsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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