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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bc7361e863affdc2f1561e02ef24a3e818b86298f2a3330578a636ee67b8e9' 
  AND token = 'JmDZd9nAXDVg0zwJK2HwxfIt2WvuuOrDl95/28LCabs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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