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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9fd76170c6d92b7b6dff7d1ccd0293c597c398160ab639d2d42899fb516075' 
  AND token = 'B7UMAsCZg2L4FcbQYIWDp5mag+JdG8Eheh046er09CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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