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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbf929592de5fd1fdcb56a0803775b7f67d0d91159eb43a1280b64071c7ffbd' 
  AND token = 'oGxoMzijk6RYL0ox+IR7HDaZJ0nAh1FSPDHI6P0qFGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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