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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc809e1bbb2e622c967360f884dee8a7362f13e29c788380de6d197912b8d55' 
  AND token = 'o4evkzdokbq55smla1vm8MfjIr5wtxbz71VciEZaEWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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