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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c5edc61608cce639cc0ad91f333bbcd3c7498628160cc503ce15bb075e7add' 
  AND token = 'C5uNFto7FwUa17xbk7dZ2B7FWXFi+3//0BIcpoph66k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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