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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5867b51dbfd98ad038f5830471ec1b8cccc7b10621f775908a33aef41a0a8635' 
  AND token = '7aZ5q++W+ePwTP5AFvIvT8kLpN30iPf413N6tUWXRVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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