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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e950f632d8dee13de32a2a589bc7d5f71ab58271f9747689cfa39cbc8bab78' 
  AND token = '6r7g7qnnLYRJVcrY55brMdJB/ohfYoN8W3SSFZBpAf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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