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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4193df2a822e266c3d3255098c6de4962a057209d92c81cfe1bb88bc49065414' 
  AND token = 'CFksVMjT0w17r4We5V2FxrzNss9yCFPJHZlv1FICI3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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