SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2d86f2ba36a0a982e948174914dbd86673ce466b5e90e6ef15da3a88bacfac' 
  AND token = 'lCPGs5SOr6/vB/yRtnrvTjL+w4J1X8V2YGfzaYLR8Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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