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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653380e50ec779b2708f62701d4412e71d66c319baaaac0ce515564f74b7ea6e' 
  AND token = '5sS1zh9z5yRnD5p5pXiPWyH3u9Om9CHATYD5exdoynA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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