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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c0ee42a34db67d48c3537ac4efd346e86cb32a86a81ba389bd35f263d5e7fb' 
  AND token = 'exRSsk3RkPra4FAaK1l1RwtxM6selsCkJQS+Sv3nhJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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