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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ecf677357e04f4165540f62aba5827a3d04d5804621bbea69047103283c551' 
  AND token = 'Qn4/TSBHSsAJp7fchalyQYp74DaJHoKywzKNnXKVGiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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