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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2e255bf0019aa7ae834b17d9a03ab301d2fe70f9975c543965fa84da8a8054' 
  AND token = 'L2QqzMbg5Wn1aacUxz6rapBSst50K9+4IR0o1ge9uwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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