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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1153001d4ee4388860dbafec5cde118e9b9212f75a5c13387f7228505d4774' 
  AND token = 'b0wR1ymXqyw31rTTZcDwrQIp/lQQcfDIl41u3H/Blvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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