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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bf07353e8c5543170c8825efa2c733504226382e37fd3b10f221d4c1b1302b' 
  AND token = 'ZlWv08KvifU1iUJo7lFIy9j76uuOhq5cXTUYbJWAouo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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