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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd8c0a8e73fc5deaa0c6426c425e1c34bf67a5d095ad7a09e5c22289b1ea06f' 
  AND token = '7/rgcwSafo+NSAGZNdvyZUT8TB1sX5wmJ7Omj5fBGgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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