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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c048f59ffcc9ce471d5f06b37e978bcc720d7633dd455ea3c509177d9b0bee' 
  AND token = 'ombB+7MjNFNbI/D+2VyhqR2KW2G32Fg8+3XSKW8jusM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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