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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1730b3b4993269393cb6b76e429181e79bb9c008fd8177df819e2cd3b12d5a47' 
  AND token = 'ns7f/PcM2wTJGYZCX99OBczn1iBKw604/FmfIEnfXlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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