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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d6a161690be8b181cbc5bbfb37f7395a5676da2badbe379a4514817cd53964' 
  AND token = 'K2gE0MUCOBYlt3gZoR5bnwnWtKOKrDKqGmJOab9nS2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00217

JSON explain

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