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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c00224b239c2f290cbbbfba30281a3ecd4bcaa9286e21022c6feabca16f15b' 
  AND token = 'YwO0IH7KtpZ8PE3hYuneeBAK+uulHgDPVAcTmDowgDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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