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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0ce5fd2fcc6e80901c7848403a2895537c1422292c00a4af27c97ad2ee9ce8' 
  AND token = '/Mu89f4GSanIzm8+YZ6Q31leiUuPwzXoOkQl4vfC+9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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