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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e94bc3b0c7a7f08f326508d136c9d8cd2ce6b7f1f97e36df7ca0f860791256' 
  AND token = 'uTG+w2uvWdrVaq0rIKx1aKA/iEbg1U6+6ZwbFlZctwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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