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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760125334ad50be96d16354b3144b3d5d4ab6a49b9fa98033c724724c9bba760' 
  AND token = '2EaprIrUd+VocQuZUBDhMSvHmlf14iySrBLCAOAYPnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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