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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02caf0f46c079a1fa31629b8f48ecbc1d0fff273a573f3b723daf22b3acbf93c' 
  AND token = 'eVhUPa5ZNPo7k+kncD3dsVgyCe257qQ8mkLffndhwDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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