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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5a30bf3c2e13f43d509eac50120aa656bc4cdd10db54cfd9b1eaac3c414f97' 
  AND token = '5SLLJUC2A42sWQoJDmOKQcBmUyFCrsW0EFj8hj2Cq8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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