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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f5fcebc76f55cac7d7d8fc5d97e3825db1c4dd659d3f19fecc4939386247fe' 
  AND token = 'EsNv4Nyxqp8jIvzzyxfxaJ0lWnouWA0mPKabpet8tQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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