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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b31cf7c99fd701bf2bc33b4b257902833d7033e5ab304c831fd1f040bd5e82' 
  AND token = 'd0S+t+DfOsv3kSF5i8jkNPkTWXqncEPjdg4N62dK0hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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