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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1b35bc9bd55d30b9a49e19c04b92d39c8cfe225ae803184fd57e68e203d3d2' 
  AND token = 'ofyVPxku9fHgzmCsMgH1iraLRcpSabgMhiq+au1QywU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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