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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d1283312d7e0641c8c482802308c086c351a8e9bb184d5e0f7185dfe14a26a' 
  AND token = 'FwxrphhMPd1GfIvrwx0hWFBINDkDERzkelvrtkARtzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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