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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee33a213a71340a2d014c7932917340766c337b7676324c83047fe31f696700' 
  AND token = 'lSWQtePyP6qB7L4yLutt+rAFLD337nic4AS74XtFjHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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