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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5ed4a4aa9e906721462e13f8c6d703a7165b9cc8586e3efe1c56e1ed8e1940' 
  AND token = 'tQhe8DgIXndLZNo3skZHgZKB5RLSHlOAhD1/aMJ7foo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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