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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf04fefaea740d24633f567a07c4104239c609c618816de3e7e6e9a5766b165' 
  AND token = '+aXY6JXnuEPf1muPCqos3tiGJb66rcJZZnf7iAjd/qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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