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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d766c96c900cea38dec70407d629c77283759c1b7ba1eb41ef494316eba1a93' 
  AND token = 'JKUk+Tp2PrOH2V+YOZ06GwNeSbRKf9jiiTzdxg7CsK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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