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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95930064f99e5ec5abd079c7c11851869c8862837b5cc5c8cdc7708168e3c97' 
  AND token = 'HGJ4KFfxR1POuQI7ku19Ba7x3cR04a8x5A21qte7B3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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