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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60d95f665cb1d8cb74f69eba536ddde10992766f829a4dfde9f6767b92b6bae' 
  AND token = 'Pk2agcvKu6OgsjEfMDWt8AL/xbf8d1aObxf48nITZxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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