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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5d296c04f9c6b8f9a8209a869ad3b1aa2923ae2c09c4f68aeafb5b436ec04b' 
  AND token = '3DfwGIjI0enJhAYdv1f3unQYR2NT6xzZoR2YzIzPMjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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